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Acquisitions of and Investments in Businesses and Technologies Total purchase price allocated to the estimated fair values of assets acquired and liabilities assumed (Details) (Vista Research [Member], USD $)
In Thousands, unless otherwise specified
Jan. 31, 2012
Business Acquisition [Line Items]  
Cash $ 320
Accounts receivable 2,375
Inventory 264
Other current and long term assets 3,342
Property, plant, and equipment, net 834
Goodwill 11,497
Intangible assets related to business acquisition 7,810
Other intangibles 7,810
Current liabilities (3,023)
Other liabilities (150)
Total purchase price 23,269
Existing Technology [Member]
 
Business Acquisition [Line Items]  
Intangible assets related to business acquisition 4,300
Other intangibles 4,300
Customer Relationships [Member]
 
Business Acquisition [Line Items]  
Intangible assets related to business acquisition 3,260
Other intangibles 3,260
Other Intangible Assets [Member]
 
Business Acquisition [Line Items]  
Intangible assets related to business acquisition 250
Other intangibles $ 250